Load Specifications
Bullet Manufacturer:Barnes
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Win Mag. load data
Case Length (l3):2.5"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:86 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:13.5
Load data in caliber .338 Win Mag. with .338 | 250gr | Barnes Banded Solid RN bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 54,433 psi | 87% | 2385 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,229 psi | 85% | 2411 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,578 psi | 88% | 2470 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,361 psi | 89% | 2467 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,555 psi | 70% | 2392 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 53,447 psi | 86% | 2461 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,011 psi | 85% | 2543 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 53,374 psi | 86% | 2484 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,389 psi | 87% | 2487 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,126 psi | 82% | 2523 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,680 psi | 89% | 2480 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,592 psi | 86% | 2411 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,881 psi | 85% | 2595 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,937 psi | 82% | 2523 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,636 psi | 88% | 2507 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,969 psi | 88% | 2526 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,114 psi | 87% | 2592 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,390 psi | 89% | 2625 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,183 psi | 80% | 2516 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,423 psi | 66% | 2418 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,419 psi | 58% | 2329 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2572 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,011 psi | 85% | 2500 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 55,216 psi | 89% | 2523 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,998 psi | 88% | 2500 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,012 psi | 87% | 2421 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,187 psi | 88% | 2513 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,912 psi | 90% | 2536 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 55,622 psi | 89% | 2589 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 56,188 psi | 90% | 2552 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 84% | 53,911 psi | 86% | 2490 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,809 psi | 86% | 2523 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,330 psi | 86% | 2523 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,144 psi | 90% | 2628 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,766 psi | 57% | 1503 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,969 psi | 88% | 2493 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,273 psi | 87% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,853 psi | 86% | 2470 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,737 psi | 86% | 2457 fps | 98.7% |
| IMR 4350 | <<locked>> | 98% | 55,288 psi | 89% | 2526 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,490 psi | 86% | 2480 fps | 98.6% |
| IMR 4831 | <<locked>> | 98% | 53,577 psi | 86% | 2536 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,362 psi | 90% | 2552 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,680 psi | 89% | 2480 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,243 psi | 85% | 2461 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,130 psi | 90% | 2461 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,983 psi | 87% | 2467 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,405 psi | 90% | 2523 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 53,998 psi | 87% | 2513 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,143 psi | 58% | 2260 fps | 96% |
| Norma 201 | <<locked>> | 86% | 55,593 psi | 89% | 2477 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,115 psi | 90% | 2474 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,186 psi | 87% | 2513 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,072 psi | 90% | 2575 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 46,137 psi | 74% | 2530 fps | 97.5% |
| Norma URP | <<locked>> | 98% | 55,521 psi | 89% | 2579 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 54,766 psi | 88% | 2539 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,259 psi | 87% | 2579 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 55,796 psi | 89% | 2507 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,680 psi | 89% | 2520 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,391 psi | 90% | 2484 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,477 psi | 58% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,159 psi | 90% | 2523 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,796 psi | 89% | 2589 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,027 psi | 88% | 2618 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,144 psi | 90% | 2612 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,347 psi | 89% | 2638 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 53,287 psi | 85% | 2411 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,173 psi | 90% | 2477 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,071 psi | 88% | 2513 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2503 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,936 psi | 78% | 2500 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 54,998 psi | 88% | 2500 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,405 psi | 90% | 2523 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,243 psi | 85% | 2461 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,983 psi | 87% | 2467 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,998 psi | 87% | 2513 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,243 psi | 85% | 2526 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,389 psi | 87% | 2487 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,303 psi | 89% | 2507 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,534 psi | 86% | 2375 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,751 psi | 86% | 2375 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,113 psi | 85% | 2438 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,472 psi | 78% | 2497 fps | 96.6% |
| Somchem S335 | <<locked>> | 86% | 56,318 psi | 90% | 2415 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,056 psi | 87% | 2477 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,201 psi | 89% | 2510 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2575 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,632 psi | 80% | 2484 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 53,896 psi | 86% | 2359 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,028 psi | 90% | 2438 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,243 psi | 85% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,258 psi | 85% | 2448 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,505 psi | 87% | 2530 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 56,202 psi | 90% | 2480 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,737 psi | 88% | 2457 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,330 psi | 86% | 2533 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,730 psi | 73% | 2484 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,215 psi | 87% | 2503 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,434 psi | 90% | 2526 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,898 psi | 90% | 2595 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,970 psi | 59% | 2441 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,143 psi | 88% | 2513 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,082 psi | 82% | 2343 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,005 psi | 71% | 2290 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,010 psi | 82% | 2425 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,830 psi | 69% | 2277 fps | 95.8% |
| Accurate 3100 | <<locked>> | 94% | 35,578 psi | 57% | 2251 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 41,640 psi | 67% | 2293 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,661 psi | 49% | 2152 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 47,152 psi | 76% | 2392 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 40,190 psi | 64% | 2264 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 45,049 psi | 72% | 2425 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,255 psi | 79% | 2395 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,111 psi | 80% | 2369 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,033 psi | 69% | 2438 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 44,918 psi | 72% | 2428 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,885 psi | 64% | 2283 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,830 psi | 69% | 2343 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,009 psi | 50% | 2162 fps | 96% |
| Alliant Reloder-17 | 54.9 gr | 80% | 34,592 psi | 55% | 2274 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 44,324 psi | 71% | 2421 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,992 psi | 43% | 2090 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,272 psi | 55% | 2280 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,808 psi | 53% | 2293 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,470 psi | 75% | 2405 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 39,813 psi | 64% | 2293 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 40,509 psi | 65% | 2270 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,821 psi | 81% | 2379 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,254 psi | 77% | 2418 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,379 psi | 65% | 2297 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 84% | 37,449 psi | 60% | 2290 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 43,598 psi | 70% | 2359 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,630 psi | 76% | 2402 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,529 psi | 46% | 2077 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,671 psi | 70% | 2382 fps | 100% |
| Hodgdon Superformance | 62.3 gr | 86% | 39,407 psi | 63% | 2352 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 43% | 1339 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,571 psi | 73% | 2359 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 47,587 psi | 76% | 2385 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,235 psi | 68% | 2293 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,527 psi | 71% | 2313 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 40,611 psi | 65% | 2297 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,581 psi | 63% | 2251 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 29,950 psi | 48% | 2119 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,874 psi | 70% | 2369 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 49,255 psi | 79% | 2395 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,601 psi | 75% | 2372 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,978 psi | 75% | 2333 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 42,221 psi | 68% | 2297 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,751 psi | 56% | 2165 fps | 95.7% |
| Lovex S070 | <<locked>> | 84% | 37,231 psi | 60% | 2234 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 33,968 psi | 54% | 2218 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,311 psi | 74% | 2349 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,485 psi | 75% | 2349 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,192 psi | 68% | 2333 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 45,818 psi | 73% | 2421 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 37,782 psi | 61% | 2369 fps | 95% |
| Norma URP | <<locked>> | 80% | 31,009 psi | 50% | 2152 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 41,800 psi | 67% | 2346 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 34,432 psi | 55% | 2234 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 49,095 psi | 79% | 2411 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,820 psi | 78% | 2428 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,895 psi | 85% | 2438 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 44% | 1375 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,741 psi | 65% | 2283 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,397 psi | 73% | 2438 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,811 psi | 59% | 2329 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,385 psi | 49% | 2165 fps | 95.3% |
| ReloadSwiss RS 70 | 57.1 gr | 82% | 32,460 psi | 52% | 2218 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 50,372 psi | 81% | 2375 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,976 psi | 71% | 2306 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,391 psi | 60% | 2244 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 49,792 psi | 80% | 2454 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 42,975 psi | 69% | 2402 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 40,509 psi | 65% | 2270 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,751 psi | 56% | 2165 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,601 psi | 75% | 2372 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,221 psi | 68% | 2297 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 37,231 psi | 60% | 2234 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,305 psi | 61% | 2290 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,514 psi | 76% | 2388 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,600 psi | 73% | 2369 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,543 psi | 76% | 2297 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,755 psi | 64% | 2185 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,464 psi | 62% | 2201 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 42,583 psi | 68% | 2395 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 47,152 psi | 76% | 2297 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,311 psi | 76% | 2385 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 38,247 psi | 61% | 2251 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 27,833 psi | 45% | 2113 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 40,799 psi | 65% | 2336 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 47,950 psi | 77% | 2287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,830 psi | 70% | 2283 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,092 psi | 71% | 2293 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,230 psi | 58% | 2188 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,358 psi | 52% | 2152 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 80% | 49,472 psi | 79% | 2392 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,424 psi | 68% | 2287 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,792 psi | 51% | 2156 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 27,166 psi | 44% | 2106 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,039 psi | 51% | 2136 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 49,211 psi | 79% | 2431 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 37,637 psi | 60% | 2297 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,324 psi | 41% | 2103 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,092 psi | 72% | 2372 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 103 powders for .338 Win Mag. loaded with the .338 | 250gr | Barnes Banded Solid RN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,638 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,638 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Barnes Banded Solid RN they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.